A man was seriously injured after he was attacked with a crutch in Chesterfield town centre.
Officers were called to Beetwell Street at 3.30pm yesterday following reports that a man had struck another man over his head with a crutch.
The 39-year-old victim remains in hospital in a serious condition.
A 27-year-old man was arrested on suspicion of assault and remains in custody this morning.
Witnesses or anyone with information should call Derbyshire Police on 101 or Crimestoppers on 0800 555 111.